diff --git a/V2rayNG/app/src/main/kotlin/com/v2ray/ang/extension/_Ext.kt b/V2rayNG/app/src/main/kotlin/com/v2ray/ang/extension/_Ext.kt
index 71837467..403774ac 100644
--- a/V2rayNG/app/src/main/kotlin/com/v2ray/ang/extension/_Ext.kt
+++ b/V2rayNG/app/src/main/kotlin/com/v2ray/ang/extension/_Ext.kt
@@ -1,6 +1,8 @@
 package com.v2ray.ang.extension
 
 import android.content.Context
+import android.net.ConnectivityManager
+import android.net.NetworkCapabilities
 import android.os.Build
 import android.widget.Toast
 import com.v2ray.ang.AngApplication
@@ -55,3 +57,19 @@ val URI.idnHost: String
     get() = host?.replace("[", "")?.replace("]", "") ?: ""
 
 fun String.removeWhiteSpace(): String = replace("\\s+".toRegex(), "")
+
+val Context.isNetworkConnected: Boolean
+    get() {
+        val manager = getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
+        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
+            manager.getNetworkCapabilities(manager.activeNetwork)?.let {
+                it.hasTransport(NetworkCapabilities.TRANSPORT_WIFI) ||
+                        it.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR) ||
+                        it.hasTransport(NetworkCapabilities.TRANSPORT_BLUETOOTH) ||
+                        it.hasTransport(NetworkCapabilities.TRANSPORT_ETHERNET) ||
+                        it.hasTransport(NetworkCapabilities.TRANSPORT_VPN)
+            } ?: false
+        else
+            @Suppress("DEPRECATION")
+            manager.activeNetworkInfo?.isConnectedOrConnecting == true
+    }
\ No newline at end of file
diff --git a/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/MainActivity.kt b/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/MainActivity.kt
index 05fffbbd..8be75d45 100644
--- a/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/MainActivity.kt
+++ b/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/MainActivity.kt
@@ -33,6 +33,7 @@ import com.v2ray.ang.R
 import com.v2ray.ang.databinding.ActivityMainBinding
 import com.v2ray.ang.databinding.LayoutProgressBinding
 import com.v2ray.ang.dto.EConfigType
+import com.v2ray.ang.extension.isNetworkConnected
 import com.v2ray.ang.extension.toast
 import com.v2ray.ang.helper.SimpleItemTouchHelperCallback
 import com.v2ray.ang.service.V2RayServiceManager
@@ -200,10 +201,14 @@ class MainActivity : BaseActivity(), NavigationView.OnNavigationItemSelectedList
     }
 
     fun startV2Ray() {
-        if (mainStorage?.decodeString(MmkvManager.KEY_SELECTED_SERVER).isNullOrEmpty()) {
-            return
+        if (isNetworkConnected) {
+            if (mainStorage?.decodeString(MmkvManager.KEY_SELECTED_SERVER).isNullOrEmpty()) {
+                return
+            }
+            V2RayServiceManager.startV2Ray(this)
+        } else {
+            ToastCompat.makeText(this, getString(R.string.connection_test_fail), Toast.LENGTH_LONG).show()
         }
-        V2RayServiceManager.startV2Ray(this)
     }
 
     fun restartV2Ray() {